Move PERL_ASYNC_CHECK() from the runloop to control flow OPs.

For the typical code this gives a 5% speedup, and removes the cost of "safe
signals". Tight looping code will show less gains, but should never be slower.

Subtle bugs might remain - there might be constructions that enter the runloop
(where signals used to be dispatched) but don't contain any PERL_ASYNC_CHECK()
calls themselves.

1 files changed, 0 insertions, 1 deletions

diff --git a/run.c b/run.c
index be280eeedb..20c711ae3a 100644
--- a/run.c
+++ b/run.c
@@ -38,7 +38,6 @@ Perl_runops_standard(pTHX)
 {
     dVAR;
     while ((PL_op = CALL_FPTR(PL_op->op_ppaddr)(aTHX))) {
-	PERL_ASYNC_CHECK();
     }
 
     TAINT_NOT;